How to read the graph: The indicator demonstrates the impact of climate change on widespread bird populations has increased strongly in the past twenty years. The Climatic Impact Indicator (CII) measures the divergence between the population trends of bird species projected to expand their range and those predicted to shrink their range due to climate change.

Additional information

The impact of climate change on widespread bird populations has increased strongly in the past 20 years.

The number of bird species whose populations are observed to be negatively impacted by climate change is three times larger than those observed to be positively affected by climate warming in the set of widespread European land birds (EEA, 2009).